I can see Avatar's point. There is value in showing a method that has no reliance on RNG effects. I face this same dilemma with my own guides. Do I play to win, showing off complex combinations? Or should I focus instead on fundamentals, limiting myself to the bare minimum of resources?

My most important tactic is, right before pushing Namtar into the abyss, I shout "Beast from the Pit, time to feast on my s**t!" I'm not actually sure if it helps or not but it sure feels good.

More seriously, I almost always go for Binlor and heavy resistance stacking, just like you did. Namtar 1 and Namtar 2 both do a TON of magical damage. In your shoes, I would have considered using Packmaster for the Body Pact to stack even more resistance, but I can understand wanting to escape from Binlor before getting hit with the level-up piety drain.

This one was weird. I originally thought to go with Mystera and refreshment for early boss kills, but it never worked. You really need an elf for that strategy. I ended up abusing GETINDARE and TT. I even converted into Drac, but it was unnecessary.

We made an expansion and it is awesome. Really, you should check it out, especially if you're looking for some extra challenge.